Ignore errors in Drop for unix::fs::Dir

[ConradIrwin]

Fixes #124105

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[the8472]

I'm opposing this change due to #124105 (comment)

[the8472]

Since FUSE can inject EBADF into close() syscalls - which is ugly but non-fatal - I retract my opposition.

[bors]

☔ The latest upstream changes (presumably #124210) made this pull request unmergeable. Please resolve the merge conflicts.

[ConradIrwin]

Closing this. Will re-open if/when I can get some more conclusive results from testing.